For me, it's my workflow.
I write complete songs (incl production) in 2 days or less with a songwriting approach that I created.
I sat down and really looked into what hit songwriters were doing (I've been listening to and analyzing the billboards every week for years) and created what I call the gefährlich approach. I read about 20 songwriting books, went to two different conservatories and still go to literally every masterclass that comes my way, but my approach still makes the most sense to me. It solves several of the biggest problems of songwriting for me.
I've been teaching it to a couple of friends and colleagues and their results are fantastic. One of them got their music on television, another got signed. Can't say if it was because of my approach, but they still use it, so I guess it must help